The controversy over the arrest of Harvard scholar Henry Louis Gates Jr. escalated Friday, as Cambridge, Mass., police union officials called on President Obama to apologize for his criticism of the arresting officers and the White House moved to blunt criticism of the president's remarks... snip Earlier in the day, White House Press Secretary Robert Gibbs dismissed a suggestion that the backlash from police groups could be distressing to the White House, given that Obama has enjoyed a positive relationship with the law enforcement community. "I think the Fraternal Order of Police endorsed McCain," Gibbs fired back, referring to Obama's...